Develop Reference

Cant import OpenCV module in android studio

I've been trying to import Open CV module to android studio exactly as many tutorials online told me to but it wont work. I googled the issue a bit and found a solution to choose the sdk folder as the directory and not java but even that dosent work.Im using Android Studio v4.0.1 and the latest version of OpenCV. Help.

First of all make sure your sdk folder in your downloaded opencv sdk contains a build.gradle file. If your downloaded sdk doesn't have build.gradle try another version of opencv sdk, Unless you have to select java folder in the opencv sdk and after that copy jni files into your project tree.
The easiest way to import OpenCV sdk into your project is as follow:
Create an Android Project
File -> New -> Import Module -> path to OpenCV/sdk/ -not java folder! (opencv 4+)
File -> Project Structure -> add OpenCV as 'Module Dependency' of 'app'
Clean Project
Done! no need to copy jni libs and other things.

Importing opencv to androidstudio
->First download opencv from https://opencv.org/releases/
for your current using android studio version,and extract it.
->open android studio create new project if project is already
exist follow the below.
->in android studio choose option in MENU->File->Import
Module here please select the your opencv-android directory
till sdk selection
eg:("E:\stardev\OpenCV-android-sdk\sdk") and
then finish, if your downloaded same version it's good to go
else change the build.gradle setting from opencv build.gradle
and sync.
->after this to add as a dependency in android studio
Choose
Menu->File->Project Structure->dependencies,
select app from tab and add(+ icon) from menu select module
dependency and select sdk from here.
->to test goto your project activity and
(import org.opencv.core.Core)

If you are using Arctic fox and still facing this issue, This Solution worked for me.
If your next and/or finish buttons is still not clickable after adding the right path
https://stackoverflow.com/a/68738767/12052997

Compile errors in new Android project in Eclipse

I'm using Eclipse for build an Android project. when I try to open bellow item :
file --> new --> Android Application Project
Then when the project is built a series errors displayed :
I am a beginner in this regard and thank you for your help.

Open AppCompactv7 and add as library on your project

The problem is with your appcompat_v7 project. Delete the existing project one in the workspace and re-import it from
\sdk\extras\android\support\v7\appcompat
After that try cleaning the project.
Project -> select Clean -> select the project.

1 - Make sure library project(appcompat_v7) is open & is proper referenced (added as library) in your application project.To do this follow this steps: right click in your project -> "Properties - Android - Add"
2 - Delete android-support-v4.jar from your project's libs folder(if jar is present).
3 - Appcompat_v7 must have android-support-v4.jar & android-support-v7-appcompat.jar inside it's libs folder. (If jars are not present copy them from /sdk/extras/android/support/v7/appcompat/libs folder of your installed android sdk location)
4- Check whether ActionBarActivity is properly imported. (In your case this is right)
import android.support.v7.app.ActionBarActivity;
Here is a good example of how to create a project in Eclipse using v7 Support Library
Finally because you are a beginner I'll recommend you to use Android Studio as it is the official environment for developing for Android. Configuring the SDK can be quite a pain in Eclipse. You can also take advantage of the Gradle dependency system and simply specify which libraries you would like to use and Android Studio will automatically fetch the jars from online remotes as required. I think its the future of Android Application Development.

Including library to android project

I have downloaded a library from github, and imported it as android project.
In this library that called Library under preferences -> Android I have set it as a library project as seen bellow:
Now I want to add this library to my Android project that called test. So I Right-Click on it and than preferences -> Android, after that I click add... and choose the library, as seen below:
Than I hit ok and apply and ok again. Nothing happens. After that I click again Right-Click on my project and than preferences -> Android and here is what I see:
What should I do to make it work fine?
The github project link is here.

I downloaded the project from the git and checked it,The .project file for eclipse is missing.
My solution would be create a new project and use these resources

Eclipse Android: how to use a library project with linked folders?

If I have simple android library (set with project->properties->android->Library) with linked folders, the linked folders are not included in the application using the library.
Choosing a library project will add a link in the application project to the library's 'src' folder and all real folders, but it will ignore any linked folders in the Library project.
---Edit: this actually works with more recent Eclipse and adt---
I can add the library as a project dependency (project->properties->javabuildpath->project) - this will make Eclipse aware of the classes in the linked folders, and fix the compile errors in Eclipse, but will not include the library classes in the apk itself and the app will fail with java.lang.NoClassDefFoundError.
What is your suggestion on using a library project with source folders linked in from outside of the library project's main folder?

The solution was under my nose all the time:
Apparently with a more recent version of eclipse and/or android tools it is enough to add the library as a project dependency project -> properties -> javabuildpath -> project.
No need to use the android library setting at all project -> properties -> android.
I am now using eclipse Helios (3.6) with Android tools 10.0.1, and it works in this combination.

Cannot Reference LVL Android Library in my App Project

I'm following the instructions found at http://developer.android.com/guide/publishing/licensing.html
I made a copy of the <sdk>/market_licensing directory, then using the New Project Wizard in Eclipse I created a new Android project from Existing source and pointed it at the library subdirectory in my copy of market_licensing.
I've checked the "is Library" box in the market_licensing project android properties.
I've added that project as a library project in my app project. It shows up in the list with a green checkmark.
When I save the project settings and rebuild, the compiler can't find the classes in the LVL project and when I go back into my app's project settings the entry in the libraries list now has a red X instead of the green checkmark.
I don't understand what I'm doing wrong which is preventing me from referencing the LVL project. Any help?
EDIT: I've tried adding the licensing project to my build path for my app project and then I'm able to build, but when I try to run the app crashes because it can't find any of the library code. So clearly the "library" status of the licensing project is not set up correctly and/or its not being automatically injected into my app project on build.

I was posting up a similar question and as I did so realised what the problem was - see here In eclipse, unable to reference an android library project in another android project